title: Alpha-plutonium's Grüneisen parameter.
abstract: Reported Grüneisen parameters γ of alpha-plutonium range from 3.0 to 9.6, which is remarkable because typical Grüneisen parameter uncertainty seldom exceeds ± 0.5. Our six new estimates obtained by different methods range from 3.2 to 9.6. The new estimates arise from Grüneisen's rule, from Einstein model and Debye model fits to low-temperature ΔV/V, from the bulk modulus temperature dependence, from the zero-point-energy contribution to the bulk modulus, and from another Grüneisen relationship whereby γ is estimated from only the bulk modulus and volume changes with temperature (or pressure). We disregard several high estimates because of the itinerant-localized 5f-electron changes during temperature changes and pressure changes. Considering all these estimates, for alpha-plutonium, we recommend γ = 3.7 ± 0.4, slightly high compared with values for all elemental metals.
authors.affiliation: Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA. Hassel.Ledbetter@colorado.edu
authors.forename: Hassel
authors.initials: H
authors.lastname: Ledbetter
authors.forename: Andrew
authors.initials: A
authors.lastname: Lawson
authors.forename: Albert
authors.initials: A
authors.lastname: Migliori